[U-Boot] [PATCH v5 015/101] x86: timer: use a timer base of 0

[Bin Meng]

On Mon, Nov 25, 2019 at 12:11 PM Simon Glass <sjg at chromium.org> wrote:
>
> On x86 platforms the timer is reset to 0 when the SoC is reset. Having
> this as the timer base is useful since it provides an indication of how
> long it takes before U-Boot is running.
>
> When U-Boot sets the timer base to something else, time is lost and we
> no-longer have an accurate account of the time since reset. This
> particularly affects bootstage.
>
> Change the default to not read the timer base, leaving it at 0. Add an
> option for when U-Boot is the secondary bootloader.
>
> Signed-off-by: Simon Glass <sjg at chromium.org>
> ---
>
> Changes in v5: None
> Changes in v4:
> - Enable option for slimbootloader, coreboot, efi
> - Reverse the sense of the CONFIG option
>
> Changes in v3: None
> Changes in v2: None
>
>  arch/x86/cpu/coreboot/Kconfig       |  1 +
>  arch/x86/cpu/slimbootloader/Kconfig |  1 +
>  drivers/timer/Kconfig               | 14 ++++++++++++++
>  drivers/timer/tsc_timer.c           |  3 ++-
>  lib/efi/Kconfig                     |  1 +
>  5 files changed, 19 insertions(+), 1 deletion(-)
>

Reviewed-by: Bin Meng <bmeng.cn at gmail.com>